Medicaid programs offered by states that have been authorized by the Secretary of the U.S. Department of Health and Human Services (HHS) to waive certain Medicaid statutory requirements giving them more flexibility in Medicaid program operation. Included are home and community care based (HCBC) waiver programs operated under Section 1915(c) of the Social Security Act that allow long-term care services to be delivered in community settings; managed care/freedom of choice waiver programs operated under Section 1915(b) of the Social Security Act which allow states to implement managed care delivery systems or otherwise limit individuals' choice of provider under Medicaid; and research and demonstration project waiver programs operated under Section 1115 of the Social Security Act to projects that test policy innovations likely to further the objectives of the Medicaid program. Each of the states has developed waivers to meet their needs; and while every state's waiver programs have their own unique characteristics, there may also be common threads.